diff --git a/app/models/case_log.rb b/app/models/case_log.rb
index 655c3c641..9cc36d235 100644
--- a/app/models/case_log.rb
+++ b/app/models/case_log.rb
@@ -528,7 +528,7 @@ private
     if rsnvac.present?
       self.newprop = has_first_let_vacancy_reason? ? 1 : 2
     end
-    self.managing_organisation_id = owning_organisation_id
+    self.managing_organisation_id ||= owning_organisation_id
     self.incref = 1 if net_income_refused?
     self.renttype = RENT_TYPE_MAPPING[rent_type]
     self.lettype = get_lettype